Skiving machine



. Aug. 6, 1929. F. WJGIBSON 1,723,233

SKIVING MACHINE Filed DBO. 1927 2 Sheets-Sheet 1 Inventor Frank/1'0 W G/bao/r A llorney 2 I F. w. GIBSON 1,723,233

.SKIVING MACHINE Fi1e d Dec. 5, 1927 2 Sheets-Sheet 2 A llor ne y Patented Aug. 6, 1929.

UNITED STATES 1,123,233 PATENT OFFICE.

FRANKLIN W. GIBSON, OF SEATTLE, WASHINGTON..

sxrvme MACHINE.

Application filed December 5, 1927. Serial No. 237,618.

My present invention relates to an improved skiving machine which -while adapted for various uses is especially and particularly designed for use in a shoe repair shop and is of the hand-operated type.

The invention consists in certain improvements in the combination and arrangement of the feed rollers and the skiving knife and in improvements in the knife itself with reillustrated one complete example of the physical embodiment of my invention wherein the parts are combined and arranged according to the best mode I have so far devised for the practical application of the principles of my invention.

Figure 1 is a view in rear elevation of a well known type of skiving machine having the improvements of my invention installed thereon.

Figure 2 is an enlarged end view showing the operating parts of the machine.

Fig. 3 is a vertical sectional view at line 3-3 of Fig. 1. t

Fig. a is a top plan view showing the knife and its adjustable support in relation to the feed rollers. I

Fig. 5 is an enlarged detail sectional view at line 5-5, Fig. 4, showing the eccentric means for angularly adjusting the blade of the knife.

Fig. 6 is an enlarged detail sectional view at line 66 of Fig. 2.

Fig. 7 is a perspective view showing the eccentric support by means of which the knife is angularly adjusted.

Fig. 8 is a perspective view showing a shoe sole with the tapered or beveled rear edge that is cut by the skiving machine.

In order that the general arrangement and relation of parts may readily be understood I have shown in Fig. 1 a well known ty e of leather cuttlng machine comprising the main frame 1 which is provided with a fixed cuttlng table 2 and the cutters 3 and 4 adjacent to the table which are used for cutting shoe soles, in usual manner.

lhe shoesoles after being fashioned or cut to shape are given a taper or bevel as indicated in Fig. 8 where the sole is designated S and the bevelB.

The sole S is fed to the knife which cuts the bevel through a pair of feed rollers 5 and 7 the former having a shaft 6 with a fixed bearing in the main frame,-and the lower roller 7, which is corrugated is provided with a shaft ,8 that is journalled in the adjustable frame 9. A train of gears 10 is indicated in dotted lines in Fig. 1 in thegear casing 11 and a hand crank 12 is used to operate the rollers through the train of gears and their shafts.

The lower corrugated feed roller 7 is adjustable with relation to its complementary roller for the purpose of accommodating various thicknesses of shoe soles as designed for mens and womens shoes. The frame 9 of the lower roller is provided with a vertically disposed stud 13 which is movable in' thebearing boss 14 of the frame 1. Below,

the stud a spring 15 is interposedbetween the head 16 on the stud and a head 17 on the I that the latter tends to urge the frame and its lower roller upwardly at all times. The frame 9 may be lowered in order to move the lower roller away from the upper roller for a thicker piece of leather through the operation of a cam lever 20 which is located in position where it is readily accessible for the operator of the machine. This cam lever is pivoted on a bolt 21 which is screwed into the frame 9 and loosely passes through 3. lug on the main frame or rather on the boss 14 of this frame. The bolt is provided with a head 22 and a cam block or washer 23 is supported above the bolt head and provided with a guide face 24 for coaction with the periphery of the boss 14 to hold this cam block in proper position. The cam block on its upper face is provided with cams 25 and the head of the cam lever is interposed between these'cam faces and the underside of the lug 14 of the boss 14. Thus it will be apparent that when the lever is turned to the of the main frame.

different dotted line positions in Fig. 6, due to the cam action, the frame which supports the lower roller may be depressed against the tension of the spring 15, for the purpose of holding the lower roller inspaced adjustment from the upper roller.

The feed rollers of course are designed to feed the shoe sole to the horizontally disposed knife 26 which is retained in its frame 27 by means of the screws 28. supported in such manner that it may be adjusted angularly for the purpose of changing or varying the relation of the knife to the feed rollers to vary the bevel or tapered cuton the shoe sole as indicated at B in Fig. 8. 3

A one "side the knife frame 27 is pivoted on a screw 29 which is threaded into a link This screw may be tightened to clamp the frame in rigid position and it may be loosened to permit swinging of the frame on the bolt or screw as a. center for accomplishing the angular adjustment of the knife. 7

At the opposite sideof the knife frame is provided an enlarged cylindrical sleeve 31 in which isencased an eccentric 32 and this eccentric has a head with a gauge on its exterior face and an exterior handle 3 onthe head may be used to turn the eccentri 32 within the sleeve 31. A bolt passes through the head and the eccentric and is threaded intoa part of the main frame 1 of the machine. This bolt has a head 36 and handles 3'7 thereon, and it will be apparent that when the bolt 29 has been loosened, by turning the head 36 the bolt 35 may be loosened in its main frame 1. Then by turning the head 33 of the eccentric, the latter inis frame is 7 may be turned within the sleeve 31 and as the bolt 35 is located eccentrically to the longitudinal center or axial center of the eccentric 32 it will be apparent that the sleeve 31 and frame 27 will be raised or lowered depending upon which way the eccentric is turned. After the eccentric has been turned to desired position the head 36 is turned by grasping the handles 37 and then the eccentric and the sleeve 31 are rigidly clamped against the main frame and of course the knife frame and knife are held thus in rigid position.

Having thus fully described my invention what I claim as new and desire to secure by Letters l-Patent is:

1. The combinat on in a leather working machine with its main frame and upper roller of a movable frame and its lower roller, a stud on the movable frame supported in the .inain frame and a tension spring below said stud, a bolt threaded to the movable frame and supported in the main frame, a cam block on the bolt, and a cam lever on said bolt for coaction with the block.

2. The combination in a leather working machine with its main frame and feed rollers, of a knife frame, a screw for securing the knife frame to the main frame at one side of the knife, said knife frame having a sleeve at the other side of the knife, an eccentric in said sleeve, and a bolt fastened to the main frame and rotatably supporting the eccentric at the axis of rotation thereof.

In testimony whereof I aiiix my signature. I

FRANKLIN w. GIBSON. 

